Munditia hedleyi | |
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Original drawing with three views of a shell of Munditia hedleyi | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Clade: | Vetigastropoda |
Superfamily: | Trochoidea |
Family: | Liotiidae |
Genus: | Munditia |
Species: | M. hedleyi |
Binomial name | |
Munditia hedleyi (Pritchard & Gatliff, 1899) | |
Synonyms | |
Liotia hedleyiPritchard, G.B. & Gatliff, J.H. 1899 |
Munditia hedleyi is a species of small sea snail, a marine gastropod mollusk, in the family Liotiidae. [1]
In biology, a species ( ) is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.
Sea snail is a common name for snails that normally live in salt water, in other words marine gastropods. The taxonomic class Gastropoda also includes snails that live in other habitats, such as land snails and freshwater snails. Many species of sea snails are edible and exploited as food sources by humans.
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
(Original description by Pritchard & Gatliff) The height of the shell attains 2 mm, its diameter 4 mm. The discoid shellcontains three and a half whorls. The body whorl is angulated by the uppermost of three prominent spiral keels, which are crossed by about twenty well-defined transverse ridges, causing distinct serration of the keel, from an apical aspect. These ridges are directed obliquely backwards, only slightly noticeable between the suture and first keel, more distinct between that and the second, and continuing so to the umbilical keel. The interstices are under the lens finely striated, the striae running parallel to the ridges. These fine striae cause interference with the light, giving rise to iridescence when viewed obliquely.
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.
The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk.
In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements.
The aperture is circular and continuous. The lip is broadly margined, the margin being sculptured in a manner similar to the other portion of the body whorl. The shell is widely umbilicated, the umbilicus is carinated, the area between the carination and keel concave. The shell is a uniform cream colour, slightly tinted with brown. The operculum is concentric, of uniform thickness, concave and shelly on the exterior, which is faintly granular. It is horny on its inner face. (described as Liotia hedleyi ) [2]
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.
In the shell of gastropod mollusks, the lip is the free margin of the peristome or aperture of the gastropod shell.
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral side of many snail shells, including some species of sea snails, land snails, and freshwater snails.
This marine species is endemic to Australia. It is found off South Australia, Tasmania and Victoria
South Australia is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of 983,482 square kilometres (379,725 sq mi), it is the fourth-largest of Australia's states and territories by area, and fifth largest by population. It has a total of 1.7 million people, and its population is the second most highly centralised in Australia, after Western Australia, with more than 77 percent of South Australians living in the capital, Adelaide, or its environs. Other population centres in the state are relatively small; Mount Gambier, the second largest centre, has a population of 28,684.
Tasmania is an island state of Australia. It is located 240 km (150 mi) to the south of the Australian mainland, separated by Bass Strait. The state encompasses the main island of Tasmania, the 26th-largest island in the world, and the surrounding 334 islands. The state has a population of around 526,700 as of March 2018. Just over forty percent of the population resides in the Greater Hobart precinct, which forms the metropolitan area of the state capital and largest city, Hobart.
Victoria is a state in south-eastern Australia. Victoria is Australia's smallest mainland state and its second-most populous state overall, making it the most densely populated state overall. Most of its population lives concentrated in the area surrounding Port Phillip Bay, which includes the metropolitan area of its state capital and largest city, Melbourne, Australia's second-largest city. Victoria is bordered by Bass Strait and Tasmania to the south, New South Wales to the north, the Tasman Sea to the east, and South Australia to the west.
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